# Relationship history for MSHA mine 4103767

Current hierarchy: **Terry  Hyles → Clear Fork Materials Company → CLEAR FORK MATLS CO**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Clear Fork Materials Company → CLEAR FORK MATLS CO; 1993-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Terry  Hyles  et al → CLEAR FORK MATLS CO; 1993-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Terry  Hyles  et al → Clear Fork Materials Company; 1993-05-01 to current/open; source msha-controller-operator-history